From: fche@redhat.com (Frank Ch. Eigler)
To: Frederic Weisbecker <fweisbec@gmail.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Arnaldo Carvalho de Melo <acme@redhat.com>,
Paul Mackerras <paulus@samba.org>,
Stephane Eranian <eranian@google.com>,
Cyrill Gorcunov <gorcunov@openvz.org>,
Tom Zanussi <tzanussi@gmail.com>,
Masami Hiramatsu <mhiramat@redhat.com>,
Steven Rostedt <rostedt@goodmis.org>,
Robert Richter <robert.richter@amd.com>
Subject: Re: [RFC] perf: Dwarf cfi based user callchains
Date: Wed, 13 Oct 2010 11:13:27 -0400 [thread overview]
Message-ID: <y0mmxqi6s88.fsf@fche.csb> (raw)
In-Reply-To: <1286946421-32202-1-git-send-regression-fweisbec@gmail.com> (Frederic Weisbecker's message of "Wed, 13 Oct 2010 07:06:52 +0200")
Frederic Weisbecker <fweisbec@gmail.com> writes:
> [...]
> This brings dwarf cfi based callchain for userspace apps that don't have
> frame pointers.
Interesting approach!
> [...]
> - it's slow. A first improvement to make it faster is to support binary
> search from .eh_frame_hdr.
In systemtap land, we did find a dramatic improvement from this too.
Have you measured the cost of transcribing of potentially large chunks
of the user stacks? We did not seriously evaluate this path, since we
encounter megabyte+ stacks in larger userspace apps, and copying THAT
out seemed absurd.
- FChE
next prev parent reply other threads:[~2010-10-13 15:13 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-13 5:06 [RFC] perf: Dwarf cfi based user callchains Frederic Weisbecker
2010-10-13 5:06 ` [RFC PATCH 1/9] uaccess: Make copy_from_user_nmi() globally available Frederic Weisbecker
2010-10-13 7:15 ` Peter Zijlstra
2010-10-13 14:47 ` Frederic Weisbecker
2010-10-13 20:43 ` Peter Zijlstra
2010-10-13 5:06 ` [RFC PATCH 2/9] perf: Add ability to dump user regs Frederic Weisbecker
2010-10-13 7:20 ` Peter Zijlstra
2010-10-13 14:56 ` Frederic Weisbecker
2010-10-13 14:58 ` Frederic Weisbecker
2010-10-14 11:06 ` Stephane Eranian
2010-10-14 11:20 ` Frederic Weisbecker
2010-10-15 8:39 ` Stephane Eranian
2010-10-15 22:58 ` Frederic Weisbecker
2010-10-17 10:07 ` Peter Zijlstra
2010-10-18 10:01 ` Stephane Eranian
2010-10-18 22:35 ` Frederic Weisbecker
2010-10-20 9:24 ` Stephane Eranian
2010-10-20 16:13 ` Frederic Weisbecker
2010-10-20 16:19 ` Peter Zijlstra
2010-10-13 5:06 ` [RFC PATCH 3/9] perf: Add ability to dump part of the user stack Frederic Weisbecker
2010-10-13 7:22 ` Peter Zijlstra
2010-10-13 15:01 ` Frederic Weisbecker
2010-10-13 5:06 ` [RFC PATCH 4/9] perf: Don't record frame pointer based user stacktraces if we dump stack and regs Frederic Weisbecker
2010-10-13 7:23 ` Peter Zijlstra
2010-10-13 15:02 ` Frederic Weisbecker
2010-10-16 0:19 ` Frederic Weisbecker
2010-10-13 5:06 ` [RFC PATCH 5/9] perf: Support for dwarf mode callchain on perf record Frederic Weisbecker
2010-10-13 5:06 ` [RFC PATCH 6/9] perf: Build with dwarf cfi Frederic Weisbecker
2010-10-13 5:06 ` [RFC PATCH 7/9] perf: Support for error passed over pointers Frederic Weisbecker
2010-10-13 5:07 ` [RFC PATCH 8/9] perf: Add libunwind dependency for dwarf cfi unwinding Frederic Weisbecker
2010-10-13 5:07 ` [RFC PATCH 9/9] perf: Support for dwarf cfi unwinding on post processing Frederic Weisbecker
2010-10-13 15:13 ` Frank Ch. Eigler [this message]
2010-10-20 15:35 ` [RFC] perf: Dwarf cfi based user callchains Frederic Weisbecker
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